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Highlights

Read more about how ransomware can lock your computer

Download the latest security updates from the Microsoft Update website

Download the new Microsoft Security Intelligence Report application for Windows

Blogs

MSRT September 2013 - Win32/Simda

Tuesday, September 10, 2013 10:00 AM

Reversal of fortune: Sirefef’s registry illusion

Monday, August 19, 2013 4:38 PM

The original AppCompat (solving a 20-year-old mystery for me)

Monday, August 12, 2013 11:19 PM

Community issues

essentials won't start, uninstall, or reinstall

Asked Tuesday, September 3, 2013

PC status is at risk because your PC isn't being monitored because the app's service stopped.

Asked Tuesday, September 3, 2013

Cannot reinstall MSE on Win 7 Ult 64-bit--error code 0x80070005 (and have tried everything I have found listed)

Asked Wednesday, September 4, 2013

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